Crossover-less Speakers

I don't know if anyone has mentioned this yet but even "single driver" speakers have crossovers. Different parts of the cone respond at different frequency, so there is a mechanical, rather than electronic, crossover. "Whizzer" cones, found on some well known "full range" drivers are an extreme example. Only a headset driver is small enough to cover the entire spectrum without breakup.

Inpepinnovations...My Bose 901s are still in their boxes waiting for my pool room to be finished. It's a huge room with cathedral ceiling, hard surfaces all around, and little furniture, and I am working on a hunch that the 901s will have a synergy with that acoustic environment.

Inpepinnovations...Yes, I plan to do that. I also wonder if the Behringer DEQ2496 can emulate the Bose equalizer that comes with the speakers. Also, I will find out what the equalization curve of the Bose unit is. This seems to be a deep dark secret.

Inpepinnovations...Yes..the small sealed box aspect of the original Bose 901 was an important element of the design. Most speaker designers try to get the resonant frequency of their driver/box down as low as possible. Prof. Bose noted that if you push the resonant frequency the other way, up, (and 200 Hz sounds familiar) the roll-off below resonance, although steep, is very smooth and can be effectively corrected by electronics.

The resulting requirement for a high power amp was the downfall of this design. I assume that the present-day 901
which is vented also has a high resonant frequency, although, as you say, this is more complicated than a simple "too small" sealed box.